diff --git a/requirements/documentation.txt b/requirements/documentation.txt
index be76792..ada7e9a 100644
--- a/requirements/documentation.txt
+++ b/requirements/documentation.txt
@@ -4,4 +4,4 @@
 myst-parser[linkify]>=1,<5
 sphinx-autobuild==2024.*
 sphinx-copybutton>=0.2,<1
-sphinx-rtd-theme>=1,<3
+sphinx-rtd-theme>=1,<4